Powdery Mildew on Rosemary - Knowledgebase Question

Eau Claire, WI
Avatar for SuzQPhilby
Question by SuzQPhilby
May 17, 1998
My rosemary plants have a powdery-mildew-like disease that started about 6 months ago after I stopped misting it. What should I do to treat it?

Answer from NGA
May 17, 1998
Just as you observed, spraying your rosemary plants with water actually can help to control powdery mildew. Unlike most other fungal diseases, powdery mildew can be held in check by strong sprays of water that simulate a downpour.

Another effective treatment is regular sprays with compost tea solution. To make the spray, mix one part mature compost that contains some manure with five parts water. Let the mixture sit in the shade for two weeks, then filter through cheesecloth and spray on your plants. You can dilute it by half if you like. Repeat every two weeks.

I hope you have some success with these methods. Good luck.

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

( No account? Join now! )

Today's site banner is by Murky and is called "Water Lilies with a Happy Bee"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.